Dipper-dredge.



B. KRBHER.

DIPPER DREDGB.

APPLICATION mum APR. 3, 1911.

Patented Apr. 16, 1912.

2 SHEETS-SHEET 1.

INVENTOR ATTORNEYS COLUMBIA PLANOGIAPM fill-,WASHINETON. u. c.

B. KREHER.

DIPPER DREDGE.

APPLICATION FILED Arms, 1911.

Patented Apr. 16, 1912.

2 SHEBTSSHEET 2.

ATTORNEYS COLUMBIA PMNDGRAPH co., wasumtn'on, b c.

UNITED STATES PATENT OFFICE.

ERNEST KREHER, 0F TAMPA, FLORIDA.

DIPPER-DREDGE.

To all whom it may concern:

Be it known that I, Ennas'r Kinsman, a citizen of the United States, anda resident of Tampa, in the county of Hillsboro and State of Florida,have invented a new and Improved Dipper-Dredge, of which the followingis a full, clear, and exact description.

This invention relates to dipper dredges, and has reference moreparticularly to a dredge of this class which comprises a boom, a cannonpivotally associated with the boom, a dipper stick slidable relativelyto the cannon, a dipper carried by the stick, and means for actuatingthe dredge.

An object of the invention is to provide a simple and efficient dipperdredge which has a large range of operation, which can be easilycontrolled, and in which more than the entire length of the dipper stickis effective in the operation of the dredge.

A further object of the invention is to provide a dipper dredge whichhas a cannon pivotally associated with the boom. to increase the rangeof the dredge. means bein provided for clamping and locking the dipperstick relative to the cannon, at

any desired point of the travel of the stick.

The invention consists in the construction and combination of parts tobe more fully described hereinafter and particularly set forth in theclaims.

Reference is to be had to the accompany ing drawings forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the views, and in which Figure 1 is a sideelevation of an embodiment of my invention. showing certain of the partsin different positions in dotted outline; Fig. 2 is a perspective viewof the cannon, having parts broken away. and showing a portion of thedipper stick: Fig. 3 is a fragmentary plan view of the dipper stick;Fig. 4 is an enlarged transverse section of the dipper stick and thecannon. showing the means for clamping these parts relatively to oneanother. and Fig. 5 is a side elevation of the rear end of the dipperstick and the corresponding extremity of the cannon. showing a springlock used with the dipper stick.

Before proceeding to a more detailed ex planation of my invention. itshould he clearly understood that the dr dge. While particularly usefulfor example. in digging Specification of Letters Patent.

Application filed April 3, 1911.

Patented Apr. 16, 1912.

Serial No. 618,604.

phosphate, can also be used for other purposes to which dredges of thischaracter are usually applied.

W'ith the ordinary dredge, the dipper handle or stick has a fairlylimited travel in the direction of its length, and its rear end cannotpass beyond the center of the boom under any circumstances. I provide anextension cannon, which is slidably associated with the dipper stick andacts as a guide therefor. permitting the stick to pass well beyond theboom. In this way the range of the dredge is materially increased andthe depth to which it can dig is augmented. I also provide means forclamping the dipper stick and the cannon so that these parts can be heldat any desired point of travel of the stick.

Certain of the details of construction shown for example l1erewith,"formno part of the invention. and can be varied in accordance withindividual preference and special conditions, without departing from theunderlying spirit of the invention.

Referring more particularly to the drawings. I provide a boom 10, whichmay be of any suitable construction. As shown for example. it consistsof a lattice member having at the upper end a sheave 11 or sheaves, andhaving its lower end mounted to swing upon a suitable support 12 of theusual construction. The boom is supported by means of a guy 13.extending to the top of a strut member 14 held by brace lines 15, or inany other suitable manner. A platform 16 serves to carry the parts ofthe dredge. Needless to say, the platform may be replaced by a carriageor any other suitable support. This platform is usually a floatingdredge hull. Near the center, the boom has a pair of bearings 17, inwhich are journaled lrunnions 13 of the cannon 19. The cannon is ofrectangular cross section and is fashioned from side members 20.consisting ol channels. and top and bottom members 21 consisting ofplates riveted to the flanges of the munou. The trunnions 18 are carriedhv plates 22. riveted lo the channels 20.

The dipper slick 23 is of any suitable length. and consists of twospaced bars or member ll. preferably of wood. armored 25, to secure theparts together. At the front or lower end, the stick has extensions 28forming part of the hinges 29 of the dipper or bucket 30, and serving tosecure the latter to the stick or handle. Links 31 connect the dipperstick and the bucket, which may be of any preferred or common form. Thedipper has a bail 353 having a sheave 33, serving for the operation ofthe dipper. The hoisting cable 34 is secured to the bail and passesabout the sheaves 33 and 11, and along the boom to the driving mechanism(not shown).

A stop block 35 is located within the can non, at the front or lower endthereof, and is secured in position by means of a bolt 36, or in anyother suitable manner. It is re ceivcd between the side bars 24 of thestick and serves to limit the movement of the stick in the direction ofits length, the stop engaging at the spacing member 25, to pre vent thestick from passing entirely out of the cannon.

I provide a clamping device 37, which consists of a collar 38,encompassing the cannon, and fashioned in two sections or halves 39,provided with laterally disposed flanges 40, secured together by meansof bolts or rivets 41, the flanges being located at the top and bottomof the cannon. Hub plates 42 are secured by means of bolts or rivets 43,at the sides of the collar, and have hub extensions 44, which projectinto openings 45 in the collar sides. One of the hub plates has athreaded opening 46 therethrough in which is arranged a correspond inglythreaded clamping screw *7, having associated therewith, at the innerend, a clamping jaw member 48, movable in an opening 49 of thecorresponding channel side 20 of the cannon. The clamping jaw has at theouter edge a flange 50, and it is adapted to engage the correspondingside bar 24 of the dipper stick. A clamping arm 51 is rigidly secured inany manner, at the outer end of the clamping screw 47, and has pivotallyconnected to the end thereof, a link 52. The link is pivotally connectedwith the piston rod 53 associated with a piston 54 in a cylinder Thelatter is mount.- ed by means of brackets 56, upon the side of thecannon, and is adapted to receive steam or other fluid under pressure.so that. the piston can be actuated in any desired or well-known mannerto operate theclamping device. The other hub plate has a threadedopening 58 in which arranged a orre spondingly threaded adjustingl\'.\\' .311 having associated therewith at the inner end. a. clampingjaw member i similar to the member LB. and like it. provid d with aflange. 61. The jaw mem er ti-tt is inoia hthrough an opening ii? in theoth r side oi the cannon, and adapted to t-ngagithr j corresponding sidebar 24 of tho dlpprrt stick. A winged head 63 is mounted upon the outerend of the adjusting screw, which has a squared extremity 64 serving forthe manipulation thereof. Vl hen steam is admitted to the cylinder 55 itactuates the piston, which in turn swings the arms 51. then the latteris moved in one direction it assists the clamping screw 47, and forcesthe jaw member against the dipper stick, so that the latter is lockedrelative to the cannon, the stick being clamped between the two jawmembers 48 and 60. The screw 59 serves for the adjustment of the normaldistance between the jaw members, and by means of it, allowance can bemade for the wear of the parts. It will be understood that the operationof the dredge, other than that described above, is the usual one.

I employ the spring lock 26 to hold together the sides 24 of the dipperstick at the end remote from the dipper when the dipper stick is soarranged that its rear or upper extremity projects materially beyond thecorresponding end of the cannon. The spring lock 26 comprises pairs ofdoubly curved spring arms 65 which have a releas able, pivotalconnection 66. At the inner faces of the dipper stick sides 24 at therear ends, are blocks 67 constituting stops adapted to be engaged by thestop 35 of the cannon, to prevent the stick from passing on tirely outof the cannon. The spring arms have oflset parts 68 which engage at theend of the cannon when the dipper stick is pass ing through the same toits extreme extended position. The offset parts 68 of the arms formshoulders, so that the engagement thereof with the end of the cannonreleases the pivotal connections 66 of the arms. Consequently, a taperedspreader69 positioned between the dipper stick sides 24 can ass betweenthe spring arms and force t em apart. In this way, as the dipper stickreaches its most extended position the connection between the sides ofthe stick at the rear ends thereof is released. The purpose of this isto permit the operating cable 34.- to pass from between the sides of thedipper stick. This is of course necessary, as in its extended position(indicated in dotted out line in Fig. 1), the end of the dipper stick iscmn 'iletely within the cannon.

Having thus described my invention, I claim as new, and desire to secureby Letters Patent:

l. in a dipper dredge, a boom, a cannon pivotzdly mounted upon said boomat one end of said cannon, a dipper stick movable relatively to saidcannon. a dipper carried by "aid stick. and means at the end of saidrannon remote from its pivotal connection nith said boom, for clampingsaid stick in nor one of a plurality of positions relative to aidcannon.

l. in a dipper dredge, a boom, a hollow cannon pivotally connected atits upper end with said boom, a dipper stick slidable in said cannon andfreely movable through said cannon within the limits of the length ofsaid stick and said cannon, and means at. the lower end of said cannonfor securing said stick relative to said cannon.

3. In a dipper dredge, non pivotally mounted at its upper end upon saidboom, a dipper stick slidably mounted within said cannon and comprisingspaced sides having therebetween at the upper end a stop, a stop withinthe lower end of said cannon and received between said sides, and meanscarried by said cannon adjacent to its stop, for locking said stick inany one of a plurality of positions, said stick having associatedtherewith a dipper.

4. In a dipper dredge, a boom, a cannon carried by said boom, a dipperstick slidable within said cannon, saidstick having spaced sides, adipper carried by said stick, an operating cable for controlling saiddipper. said operating cable passing between said sides, and areleasable spring lock for holding together the sides of said stick,said Copies of this patent may be obtained for five a boom, a hollow canlook being released by the engagement thereof with the end of saidcannon.

5. In a dipper dredge, a boom, a cannon carried by said boom, a dipperstick slidable sides. and a spring lock for holding together the sidesof said dipper stick at the rear end thereof, said lock consisting ofpairs of releasably and pivotally connected spring arms adapted to bedisengaged by the engagement thereof with said cannon, said cannonhaving therein a s n-raider for separating said arms after the same havebeen disengaged by the engagement thereof with said cannon.

In testimony whereof I have signed my 5 name to this spccificatnni inthe presence of two subscribing witnesses.

ERNEST KR E HER.

Witnesses i. (l. VHHAKER, A. G. TURNER.

cents each, by addressing the Commissioner of Patents.

Washington, D. G.

